Two men have been charged with terrorism offences.
Ibrahim Anderson, 38 and Shah Jahan Khan, 62, from Luton have been bailed and are due appear at Westminster Magistrates' Court on Tuesday, 21 April.
The offences relate to the possession of information useful to someone wanting to carry out and act of terror and inviting support for an organisation contrary to section 12 of the Terrorism Act 2000.
A carnival parade in northern Germany has been cancelled at short notice due to a concrete threat of an Islamist attack, police said today.
The event had been due to take place this afternoon in Braunschweig.
"Reliable state security sources have made it known that a concrete threat of attack with an Islamist background exists," authorities in Braunschweig said in a statement.
The US Department of Justice has said it has charged six people with "terrorist-related crimes," for allegedly supporting groups such as Al Qaeda, Nusra Front and Islamic State in Syria and Iraq.
The six are Bosnian natives living in Missouri, Illinois and New York. Five of them were arrested in the United States and charged with conspiring to provide material support and resources to terrorists. The sixth person is overseas, the department said in a statement.
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Officers from the Met Police have said that warrants of further detention have been granted for five men arrested following a counter terrorism operation in which a vehicle was stopped going outbound at Dover port on Sunday.
Four addresses in east London and one in south London are being searched as part of the investigation. Some of the searches are still ongoing.
A further two addresses in North Wales are being searched, and these searches are ongoing, police said.
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Officers from MPS Counter Terrorism Command (SO15), Kent police and the MPS Specialist Firearms Command (SCO19) stopped an outbound vehicle at Dover port at around 11.30pm on Sunday.
Police said a further 12 men and one woman who were stopped in the same vehicle were arrested on suspicion of immigration offences by Immigration Enforcement officers.
At around 3.45am today two men aged 24 and 40 were arrested in east London, while at 8.30am a man, 28, was arrested, all on suspicion of being concerned in the Commission, Preparation or Instigation of acts of Terrorism contrary to section 41 of the Terrorism Act 2000.
Five men have been arrested on suspicion of commission, preparation or instigation of acts of terrorism in Dover and east London, Scotland Yard said.
Three more men have been arrested today. The operation was "not in response to any immediate threat," police said.
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School teacher Jamshed Javeed, 30, from Manchester, has pleaded guilty at Woolwich Crown Court to two Syria-related terrorism offences